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  • How to solve this problem- A man sets his watch by a whistle that is 2 km away.How much will his watch be in error. (speed of sound in air 330m/s)

A man sets his watch by a whistle that is 2 km away.How much will his watch be in error. (speed of sound in air 330m/s)

  • Option 1)

    3 seconds fast

  • Option 2)

    3 seconds slow

  • Option 3)

    6 seconds fast

  • Option 4)

    6 seconds slow

 

Answers (1)

best_answer

Time lost in covering the distance of 2 km by the sound waves

t = \frac{d}{v} = \frac{2000}{330} = 6.06 sec \approx 6 sec

 

Effect of wind -

As the sound is carried by air so its speed is affected by the wind velocity. Suppose the wind is blowing with a speed V_{\omega } at an angle \Theta with direction of propagation of the sound.
 

- wherein

V= V\pm V_{\omega }\cos \Theta

V_{\omega }= speed of wind

 

 

 


Option 1)

3 seconds fast

This is incorrect.

Option 2)

3 seconds slow

This is incorrect.

Option 3)

6 seconds fast

This is incorrect.

Option 4)

6 seconds slow

This is correct.

Posted by

Avinash

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